Finding the Fourth Proportional to 20,876.72, 31,323 and 12,562.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,876.72 : 31,323 = 12,562.46 : x
2. Step 2: Convert to fraction form
   20,876.72/31,323 = 12,562.46/x
3. Step 3: Cross multiply
   20,876.72x = 31,323 × 12,562.46
4. Step 4: Simplify right side
   20,876.72x = 393,493,934.58
5. Step 5: Solve for x
   x = 393,493,934.58/20,876.72
6. Step 6: Final answer
   x = 18,848.46